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首页> 外文期刊>Environmental Science & Technology >Mercury Removal by Magnetic Biochar Derived from Simultaneous Activation and Magnetization of Sawdust
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Mercury Removal by Magnetic Biochar Derived from Simultaneous Activation and Magnetization of Sawdust

机译：木屑同时活化和磁化产生的磁性生物炭去除汞

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摘要

Novel magnetic biochars (MBC) were prepared by one-step pyrolysis of FeCl_3-laden biomass and employed for Hg~0 removal in simulated combustion flue gas. The sample characterization indicated that highly dispersed Fe_3O_4 particles could be deposited on the MBC surface. Both enhanced surface area and excellent magnetization property were obtained. With the activation of FeCl_3, more oxygen-rich functional groups were formed on the MBC, especially the C=O group. The MBC exhibited far greater Hg~0 removal performance compared to the nonmagnetic biochar (NMBC) under N_2 + 4% O_2 atmosphere in a wide reaction temperature window (120-250 ℃). The optimal pyrolysis temperature for the preparation of MBC is 600 ℃, and the best FeCl_3/biomass impregnation mass ratio is 1.5 g/g. At the optimal temperature (120 ℃), the Fe_(1.5)MBC_(600) was superior in both Hg~0 adsorption capacity and adsorption rate to a commercial brominated activated carbon (Br-AC) used for mercury removal in power plants. The mechanism of Hg~0 removal was proposed, and there are two types of active adsorption/oxidation sites for Hg~0: Fe_3O_4 and oxygen-rich functional groups. The role of Fe_3O_4 in Hg~0 removal was attributed to the Fe~(3+)(t) coordination and lattice oxygen. The C==O group could act as act as electron acceptors, facilitating the electron transfer for Hg~0 oxidation.
机译：通过一步法裂解含FeCl_3的生物质制备了新型磁性生物炭（MBC），并将其用于模拟燃烧烟气中的Hg〜0去除。样品表征表明，高度分散的Fe_3O_4颗粒可以沉积在MBC表面上。获得增加的表面积和优异的磁化性能。随着FeCl_3的活化，MBC上形成了更多的富氧官能团，尤其是C = O。在N_2 + 4％O_2气氛下，在较宽的反应温度范围内（120-250℃），MBC的除Hg〜0效果要优于非磁性生物炭（NMBC）。制备MBC的最佳热解温度为600℃，最佳FeCl_3 /生物质浸渍质量比为1.5 g / g。在最佳温度（120℃）下，Fe_（1.5）MBC_（600）的Hg〜0吸附容量和吸附速率均优于用于电厂除汞的商用溴化活性炭（Br-AC）。提出了Hg〜0的去除机理，Hg〜0有两种类型的活性吸附/氧化位：Fe_3O_4和富氧官能团。 Fe_3O_4在Hg〜0去除中的作用归因于Fe〜（3 +）（t）的配位和晶格氧。 C ＝＝ O基团可以充当电子受体，促进Hg〜0氧化的电子转移。

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  • 来源
    《Environmental Science & Technology》 |2016年第21期|12040-12047|共8页
  • 作者

    Jianping Yang; Yongchun Zhao; Siming Ma; Binbin Zhu; Junying Zhang; Chuguang Zheng;

  • 作者单位

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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